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Nesprin-2 interacts with {alpha}-catenin and regulates Wnt signaling at the nuclear envelope.

ABSTRACT: Nesprins and emerin are structural nuclear envelope proteins that tether nuclei to the cytoskeleton. In this work, we identified the cytoskeleton-associated ?-N/E-catenins as novel nesprin-2-binding partners. The association involves the C termini of nesprin-2 giant and ?-N/E-catenins. ?-E/T/N-catenins are known primarily for their roles in cadherin-mediated cell-cell adhesion. Here, we show that, in addition, ?-catenin forms complexes with nesprin-2 that include ?-catenin and emerin. We demonstrate that the depletion of nesprin-2 reduces both the amount of active ?-catenin inside the nucleus and T-cell factor/lymphoid-enhancing factor-dependent transcription. Taken together, these findings suggest novel nesprin-2 functions in cellular signaling. Moreover, we propose that, in contrast to emerin, nesprin-2 is a positive regulator of the Wnt signaling pathway.

SUBMITTER: Neumann S

PROVIDER: S-EPMC2966107 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature

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Nesprin-2 interacts with {alpha}-catenin and regulates Wnt signaling at the nuclear envelope.

Neumann Sascha S Schneider Maria M Daugherty Rebecca L RL Gottardi Cara J CJ Eming Sabine A SA Beijer Asa A Noegel Angelika A AA Karakesisoglou Iakowos I

The Journal of biological chemistry 20100826 45

Nesprins and emerin are structural nuclear envelope proteins that tether nuclei to the cytoskeleton. In this work, we identified the cytoskeleton-associated α-N/E-catenins as novel nesprin-2-binding partners. The association involves the C termini of nesprin-2 giant and α-N/E-catenins. α-E/T/N-catenins are known primarily for their roles in cadherin-mediated cell-cell adhesion. Here, we show that, in addition, α-catenin forms complexes with nesprin-2 that include β-catenin and emerin. We demonst ...[more]

PMID: 20801886

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Project description:It has been suggested that drug tolerance represents a form of learning and memory, but this has not been experimentally established at the molecular level. We show that a component of alcohol molecular tolerance (channel internalization) from rat hippocampal neurons requires protein synthesis, in common with other forms of learning and memory. We identify ?-catenin as a primary necessary protein. Alcohol increases ?-catenin, and blocking accumulation of ?-catenin blocks alcohol-induced internalization in these neurons. In transfected HEK293 cells, suppression of Wnt/?-catenin signaling blocks ethanol-induced internalization. Conversely, activation of Wnt/?-catenin reduces BK current density. A point mutation in a putative glycogen synthase kinase phosophorylation site within the S10 region of BK blocks internalization, suggesting that Wnt/?-catenin directly regulates alcohol-induced BK internalization via glycogen synthase kinase phosphorylation. These findings establish de novo protein synthesis and Wnt/?-catenin signaling as critical in mediating a persistent form of BK molecular alcohol tolerance establishing a commonality with other forms of long-term plasticity.Alcohol tolerance is a key step toward escalating alcohol consumption and subsequent dependence. Our research aims to make significant contributions toward novel, therapeutic approaches to prevent and treat alcohol misuse by understanding the molecular mechanisms of alcohol tolerance. In our current study, we identify the role of a key regulatory pathway in alcohol-induced persistent molecular changes within the hippocampus. The canonical Wnt/?-catenin pathway regulates BK channel surface expression in a protein synthesis-dependent manner reminiscent of other forms of long-term hippocampal neuronal adaptations. This unique insight opens the possibility of using clinically tested drugs, targeting the Wnt/?-catenin pathway, for the novel use of preventing and treating alcohol dependency.

Dataset Information

Nesprin-2 interacts with {alpha}-catenin and regulates Wnt signaling at the nuclear envelope.

Publications

Nesprin-2 interacts with {alpha}-catenin and regulates Wnt signaling at the nuclear envelope.

Similar Datasets

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